tính 85 – 39

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{85}\\{39}\end{array}} \\\,\,\,\,46\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{86}\\{\,\,6}\end{array}} \\\,\,\,\,92\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{33}\\{17}\end{array}} \\\,\,\,\,16\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{73}\\{27}\end{array}} \\\,\,100\end{array}\)